But back in the day, keeping track of the royal brothers seemed to be quite the handful. In this vintage vid from YouTube user mileyandhayden1418 (above), which according to its title was filmed in 1984, Charles and Diana try to keep their attention focused on baby Harry in his christening gown as William, who was about 2 years old in this video, runs around the church like a blond whirlwind. (When Diana asks him if he's going to sing in church, stubborn baby Will retorts, "No.")

Also making an appearance: Zara Phillips, the queen's granddaughter and Anne's daughter, who would have been only slightly older than William; Princess Anne herself, who tries her best, bless her heart, to get toddler Wills to calm down; and the Queen Mother in a beautiful purple suit, who cradles baby Harry.